|
|
|
|
# Books add-to-app sample
|
|
|
|
|
|
|
|
|
|
This application simulates a mock scenario in which an existing app with
|
|
|
|
|
business logic and middleware already exists. It demonstrates how to add Flutter
|
|
|
|
|
to an app that has established patterns for these domains. For more information
|
|
|
|
|
this and the other add-to-app samples available in this repo, see the
|
|
|
|
|
[README](../README.md) file located in the [/add_to_app](/add_to_app) directory
|
|
|
|
|
of this repo.
|
|
|
|
|
|
|
|
|
|
This application also utilizes the [Pigeon](https://pub.dev/packages/pigeon)
|
|
|
|
|
plugin to avoid manual platform channel wiring. Pigeon autogenerates the
|
|
|
|
|
platform channel code in Dart/Java/Objective-C to allow interop using higher
|
|
|
|
|
order functions and data classes instead of string-encoded methods and
|
|
|
|
|
serialized primitives.
|
|
|
|
|
|
|
|
|
|
The Pigeon autogenerated code is checked-in and ready to use. If the schema
|
|
|
|
|
in `pigeon/schema.dart` is updated, the generated classes can also be re-
|
|
|
|
|
generated using:
|
|
|
|
|
|
|
|
|
|
```shell
|
|
|
|
|
flutter pub run pigeon \
|
|
|
|
|
--input pigeon/schema.dart \
|
|
|
|
|
--java_out ../android_books/app/src/main/java/dev/flutter/example/books/Api.java \
|
|
|
|
|
--java_package "dev.flutter.example.books"
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
## Demonstrated concepts
|
|
|
|
|
|
|
|
|
|
* An existing books catalog app is already implemented in Kotlin and Swift.
|
|
|
|
|
* The platform-side app has existing middleware constraints that should also
|
|
|
|
|
be the middleware foundation for the additional Flutter screen.
|
|
|
|
|
* On Android, the Kotlin app already uses GSON and OkHttp for networking and
|
|
|
|
|
references the Google Books API as a data source. These same libraries
|
|
|
|
|
also underpin the data fetched and shown in the Flutter screen.
|
|
|
|
|
* The platform application interfaces with the Flutter book details page using
|
|
|
|
|
idiomatic platform API conventions rather than Flutter conventions.
|
|
|
|
|
* On Android, the Flutter activity receives the book to show via activity
|
|
|
|
|
intent and returns the edited book by setting the result intent on the
|
|
|
|
|
activity. No Flutter concepts are leaked into the consumer activity.
|
|
|
|
|
* The [pigeon](https://pub.dev/packages/pigeon) plugin is used to generate
|
|
|
|
|
interop APIs and data classes. The same `Book` model class is used within the
|
|
|
|
|
Kotlin/Swift program, the Dart program and in the interop between Kotlin/Swift
|
|
|
|
|
and Dart.
|
|
|
|
|
|
|
|
|
|
## More info
|
|
|
|
|
|
|
|
|
|
For more information about Flutter, check out
|
|
|
|
|
[flutter.dev](https://flutter.dev).
|
|
|
|
|
|
|
|
|
|
For instructions on how to integrate Flutter modules into your existing
|
|
|
|
|
applications, see Flutter's
|
|
|
|
|
[add-to-app documentation](https://flutter.dev/docs/development/add-to-app).
|
